Gas Pressurized Stripping Column for CO2 Capture
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Solution Overview
Problem
Current CO2 capture technologies, particularly amine-based absorption processes, are energy-intensive and limited by low operating pressures, requiring significant compression work to achieve pipeline-ready pressures and are inefficient in energy consumption.
Innovation Solution
A gas pressurized separation system and process that utilizes a gas pressurized stripping column with high-pressure gas streams and independent temperature control, allowing for the stripping of product gas into a high-pressure gaseous effluent with reduced energy requirements, achieved by introducing a high-pressure gas stream into contact with a product-enriched liquid to yield a high-pressure gaseous effluent with increased CO2 partial pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional amine-based absorption processes are used, then CO2 capture is achieved, but energy consumption is high and operating pressure is limited
Solution Approach 1:
The patent changes the operating pressure parameter from conventional low pressure (determined by vapor pressure at reboiler temperature) to high pressure (up to 100 atm or more). This is achieved by introducing high-pressure gas streams into the stripping column, allowing CO2 stripping to occur at elevated pressures where the equilibrium favors higher CO2 partial pressure in the gas phase, thereby reducing compression work requirements while maintaining capture capability
Solution Approach 2:
The patent implements continuous heating along the stripping column using multiple heat supplying apparatuses distributed at different locations. This continuous heat input enables the high-pressure stripping process to proceed efficiently throughout the column length, maintaining the thermodynamic conditions necessary for effective CO2 stripping at high pressure without requiring intermittent or batch operation
2Use of energy by stationary object
If conventional stripping processes operate at low pressure, then heat requirement is manageable, but compression work to achieve pipeline pressure becomes excessive
Solution Approach 1:
The patent directly addresses the compression work issue by changing the operating pressure parameter of the stripping column to high pressure (up to 100 atm or more). By conducting CO2 stripping at these elevated pressures, the partial pressure of CO2 in the product gas is significantly increased, thereby reducing or eliminating the need for subsequent compression work to achieve pipeline transportation pressure
Solution Approach 2:
The patent uses high-pressure gas streams as an intermediary medium to transfer both heat and mass in the stripping column. These high-pressure gas streams serve as the stripping agent that enables CO2 release at high pressure, while also functioning as a heat transfer medium to provide the necessary thermal energy for the stripping process
3Productivity
If high pressure gas streams are introduced into the stripping column, then CO2 stripping efficiency improves and product gas pressure increases, but device complexity increases
Solution Approach 1:
The patent makes the high-pressure gas stream serve multiple functions simultaneously: it acts as the stripping agent to release CO2 from the amine solution, provides heat transfer to enable the stripping process, and produces the high-pressure product gas stream directly. This multi-functionality reduces the need for separate equipment and simplifies the overall system configuration
4Manufacturing precision
If multiple heat supplying apparatuses are provided at different locations, then temperature control precision improves, but device complexity increases
Solution Approach 1:
The patent divides the heating function into multiple discrete heat supplying apparatuses positioned at different locations along the stripping column. Each apparatus can be independently controlled to provide precise temperature management in different zones of the column, allowing optimization of stripping conditions at various heights while maintaining overall system simplicity through modular design
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces energy consumption and subsequent compression work, enabling the production of a high-pressure, pure product gas stream with improved thermodynamic efficiency compared to conventional separation processes.
Implementation Method 1
introducing a high-pressure gas stream into contact with a product-enriched liquid to yield a high-pressure gaseous effluent with increased CO2 partial pressure
Implementation Method 2
heating apparatuses for controlling the temperature two or more heat supplying apparatuses provided at different locations along the column for allowing for independent control of the temperature along the stripping apparatus or column
Data Source
AI summary
The present invention provides a gas pressurized separation system to strip a product gas from a liquid stream and yield a high pressure gaseous effluent containing the product gas. The system comprises a gas pressurized stripping apparatus, such as a column, with at least one first inlet allowing flow of one or more liquid streams in a first direction and at least one second inlet allowing flow of one or more high pressure gas streams in a second direction, to strip the product gas into the high pressure gas stream and yield through at least one outlet a high pressure gaseous effluent containing the product gas; and two or more heat supplying apparatuses provided at different locations along the column. Processes for separating a product gas from a gaseous mixture to yield a high pressure gaseous effluent containing the product gas, utilize the gas pressurized separation system described above.